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32 <br />Attachment 3 <br /> Pagel 7 <br />Environmental Sound <br />Community Noise Ordinances in North Carolina, continued <br />Community Limits for Souod into R.esideotial Areas <br />From Residential From Industrial <br />Night period, Enforcement <br /> Day Night Day Nght Measurement Techniques <br /> 60 55 60 55 lOpm-lam Zoning Code <br />Hickory Ld01DO Meas.. iD sec. apart <br />Lsnoir County 60 55 60 55 <br />Maximt>m level limit 15 dB higher IOpm-ham, Sheriff <br />L10, Measured over 10 min. <br /> 5 dB less if mnF impulse, music, or speech,. <br />Raleigh 55 45 63 55 <br />Maximum level Haut ] D dB higher llpm-lam, Poliee Dept. <br />LI O 1 DO Meas. 10 sec, apart <br /> Also has third-octave limits for low-frequency music <br />Rowan County 60 55 75 65 l Ipm-lam Environ. Serv, <br />IS-20 minute avetge <br /> 55 50 55 50 I lpm-lam, Not SpeciSed <br />Wake County Ld 0 20 Mess, ] 0 sec. apa2 <br />(Geaetal Ord.) 55 45 55 45 9pm-lam, Zoning Office <br />Wake County <br />(Zoning Ord.) 5 dBhigher if'less titan 20%of hour Maximum Level Limits Only <br /> 10 dB higher if less than 5% of hour <br /> 5 dB Lower if mnal or repetitive impulsive <br /> 65 55 75* 70* Ilpm-lam, Not SpeciSed <br />Wilmington <br />Max. slow limit 3 dB higher 1 minute average <br /> * No[ clear how limits are applied across differing uses. <br />Note - L70 indicates that 10%of measurements must not exceed stated limit. <br />